package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.List;
import java.util.function.Consumer;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        /**
         * 保存菜品数据
         * 1. 创建Dish对象
         * 2. 将dishDTO拷贝到dish对象中
         * 3. 将dish插入到表中（注意：需要插入以后的返回值id）
         * 4. 从dishDTO中获取dishFlavor集合
         * 5. 遍历集合，设置dishId
         * 6. 在哈入道dish_flavor表
         */

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        dishMapper.insert(dish);

        dishDTO.getFlavors().forEach(dishFlavor -> {
            //  设置dishId
            dishFlavor.setDishId(dish.getId());
        });

        dishFlavorMapper.insertBatch(dishDTO.getFlavors());

    }

    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        //使用Page Helper分页
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page page = dishMapper.page(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    @Override
    public void delete(Long[] ids) {
        /**
         * 1. 遍历数组获取id
         * 2. 判断如果当前菜品是起售中，不能删除
         * 3. 如果当前菜品被套餐关联了，不能删除
         * 4. 如果当前菜品有口味，需要把口味删除
         */
        for (Long id : ids){
            Dish dish = dishMapper.findById(id);
            if (dish.getStatus() == StatusConstant.ENABLE){
                //当前菜品是启售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }

            List<SetmealDish> setmealDishes = setmealDishMapper.getByDishId(id);
            if (setmealDishes != null && setmealDishes.size() > 0){
                //当前菜品被套餐关联了，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
            }
            //菜品可以删除
            dishMapper.delete(id);
            dishFlavorMapper.deleteByDishId(id);

        }

    }

    @Override
    public DishVO getByWithFlavorId(Long id) {
        /**
         * 1. 去Dish表中查询Dish
         * 2. 去DishFlavor表中查询DishFlavor
         * 3. Dish+DishFlavor封装到DishVO中返回
         */

        Dish dish = dishMapper.findById(id);
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    @Transactional
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        /**
         * 1. 修改dish表（DishDTO -> Dish）
         * 2. 删除dish_flavor表
         * 3. 批量插入dish_flavor表
         */
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.update(dish);
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        List<DishFlavor> flavors = dishDTO.getFlavors();

        flavors.forEach(new Consumer<DishFlavor>() {
            @Override
            public void accept(DishFlavor dishFlavor) {
                dishFlavor.setDishId(dishDTO.getId());
            }
        });

        dishFlavorMapper.insertBatch(flavors);

    }

    @Override
    public List<DishVO> list(Long categoryId) {
        return dishMapper.getByCategoryId(categoryId);
    }

    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);
    }
}